Cheap plasma cutter any good?

I doubt you will be happy. I have a Longevity 50 amp and im really disappointed with the performance after using the hypertherm 40 amp. Night and day.

i set my longevity up to do some long straight cuts,made a 10 foot track that ran with my cordless drill. That was the only time i was satisfied with its operation.
I dont thing you can drag it on the work. The gun will stick.